細菌の毒素であるコリバクチンは,プロファージ誘導を誘発する

Justin E Silpe¹, Joel W H Wong¹, Siân V Owen²

¹Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, USA.

Nature

|February 24, 2022

まとめ

コリバクチンという腸内細菌の遺伝子毒は SOS応答を活性化することで他の微生物でファグの発生を誘発します外因的なDNAまたは抵抗性タンパク質 (ClbS) は,この効果を防ぐことができます.

科学分野:

微生物学
分子生物学
ゲノミクス

背景:

コリバクチンは腸内細菌によって生成される遺伝子毒素で,哺乳類のシステムに作用することが知られている.
他の微生物,特に微生物群に及ぼす影響は,ほとんど説明されていない.

研究の目的:

コリバクチンが微生物群に及ぼす影響を調査する.
コリバクチンが細菌集団とプロファージの活動に影響を与えるメカニズムを解明する.

主な方法:

コリバクチンの細菌系への暴露
コリバクチンの作用における細菌のSOS反応の役割を調査する.
外因的なDNAとClbSタンパク質の保護効果の評価
コリバクチンの耐性と生物合成遺伝子の分析

主要な成果:

コリバクチンはプロファージを含むバクテリアを標的とし,SOS応答を通じてリチンの発育を誘導する.
外因的なDNAとコリバクチン抵抗性タンパク質 (ClbS) は,コリバクチンに対する保護を与える.
これらのプロファージ誘発効果は,多様なファージ・バクテリアシステムと複雑なコミュニティで観察される.
耐性遺伝子を持つが,生物合成遺伝子を持たない細菌は,コリバクチン誘発のプロファージ発現からClbS同種によって保護される.

結論:

コリバクチンの生成は,プロファージの発生を誘発することによって,微生物群の動態に影響を与えます.
コリバクチンのような微生物の天然製品は,ファグの拡散を含む,集団レベルでの出来事を媒介することができます.
ClbSタンパク質は,細菌がコリバクチンのプロファージ誘発効果に抵抗するメカニズムを提供します.

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